<template>
  <el-upload
    class="avatar-uploader"
    action=""
    :http-request="requestUpload"
    :before-upload="beforeUpload"
    :show-file-list="false">
    <img v-if="imageUrl!=null || defaultImage !=null" :src="(imageUrl!=null ? imageUrl : defaultImage)"
         class="avatar">
    <i v-else class="el-icon-plus avatar-uploader-icon"></i>
  </el-upload>
</template>

<script>
  import {uploadOss} from "@/api/common";

  export default {
    name: "UploadSingleView",
    props: {
      defaultImage: {
        type: String,
        default: null
      }
    },
    watch: {
      defaultImage(val) {
        this.reset();
      }
    },
    data() {
      return {
        imageId: null,
        imagePath: null,
        imageUrl: null
      }
    },
    methods: {
      reset() {
        this.imageId = null;
        this.imagePath = null;
        this.imageUrl = null;
      },
      requestUpload(params) {
        let _this = this;
        let file = params.file;
        let formData = new FormData();
        formData.append("file", file);
        uploadOss(formData).then(response => {
          if (response.code === 200) {
            _this.imageUrl = response.url
            _this.imageId = response.id
            _this.imagePath = response.path
            _this.$emit('onUploadResult', {
              imageUrl: response.url,
              imagePath: response.path,
              imageId: response.id
            })
          }
        });
      },
      beforeUpload(file) {
        const isJPG = file.type === 'image/jpeg';
        const isLt2M = file.size / 1024 / 1024 < 2;
        if (!isJPG) {
          this.$message.error('上传图片只能是 JPG 格式!');
        }
        if (!isLt2M) {
          this.$message.error('上传图片大小不能超过 2MB!');
        }
        return isJPG && isLt2M;
      }
    }
  }
</script>

<style>
  .avatar-uploader .el-upload {
    border: 1px dashed #d9d9d9;
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
  }

  .avatar-uploader .el-upload:hover {
    border-color: #409EFF;
  }

  .avatar-uploader-icon {
    font-size: 28px;
    color: #8c939d;
    width: 178px;
    height: 178px;
    line-height: 178px;
    text-align: center;
  }

  .avatar {
    width: 178px;
    height: 178px;
    display: block;
  }

</style>
